[PATCH net-next] net: igc: return error for link autoneg=off

["Íñigo Huguet" <ihuguet@redhat.com>]

The driver doesn't support force mode for the link settings. However, if
the user request it, it's just ignored and success is returned. Return
ENOTSUPP instead.

Signed-off-by: Íñigo Huguet <ihuguet@redhat.com>
---
 drivers/net/ethernet/intel/igc/igc_ethtool.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/igc/igc_ethtool.c b/drivers/net/ethernet/intel/igc/igc_ethtool.c
index 93bce729be76..b7b32344d074 100644
--- a/drivers/net/ethernet/intel/igc/igc_ethtool.c
+++ b/drivers/net/ethernet/intel/igc/igc_ethtool.c
@@ -1832,6 +1832,12 @@ igc_ethtool_set_link_ksettings(struct net_device *netdev,
 		}
 	}
 
+	/* The driver does not support force mode yet */
+	if (cmd->base.autoneg == AUTONEG_DISABLE) {
+		netdev_err(dev, "Force mode currently not supported\n");
+		return -EOPNOTSUPP;
+	}
+
 	while (test_and_set_bit(__IGC_RESETTING, &adapter->state))
 		usleep_range(1000, 2000);
 
@@ -1844,14 +1850,10 @@ igc_ethtool_set_link_ksettings(struct net_device *netdev,
 	if (ethtool_link_ksettings_test_link_mode(cmd, advertising, 2500baseT_Full))
 		advertising |= ADVERTISE_2500_FULL;
 
-	if (cmd->base.autoneg == AUTONEG_ENABLE) {
-		hw->mac.autoneg = 1;
-		hw->phy.autoneg_advertised = advertising;
-		if (adapter->fc_autoneg)
-			hw->fc.requested_mode = igc_fc_default;
-	} else {
-		netdev_info(dev, "Force mode currently not supported\n");
-	}
+	hw->mac.autoneg = 1;
+	hw->phy.autoneg_advertised = advertising;
+	if (adapter->fc_autoneg)
+		hw->fc.requested_mode = igc_fc_default;
 
 	/* MDI-X => 2; MDI => 1; Auto => 3 */
 	if (cmd->base.eth_tp_mdix_ctrl) {
-- 
2.44.0